Versioning XML-based office documents

The ability to reliably merge independent updates of a document is a crucial prerequisite to efficient collaboration in office work. However, merge support for common office document standards like OpenDocument or OfficeOpenXML is still in its infancy. In this paper, we present a consistent versioning model for XML documents in general including merge support. This is achieved by using context-aware fingerprints that identify edit operations and allow for a conflict detection. We show how to extract tracked changes from office documents and map them on our delta model. Experimental results indicate that our fingerprinting technique is efficient and reliable.     

Perturbing and evaluating numerical programs without recompilation—the wonglediff way

wonglediff is a program that tests the sensitivity of arbitrary program executables or processes to changes that are introduced by a process that runs in parallel. On Unix and Linux kernels, wonglediff creates a supervisor process that runs applications and, on the fly, introduces desired changes to their process state. When execution terminates, it then summarizes the resulting changes in the output files. The technique employed has a variety of uses. This paper describes an implementation of wonglediff that checks the sensitivity of programs to random changes in the floating‐point rounding modes. It runs a program several times, ‘wongling’ it each time: randomly toggling the IEEE‐754 rounding mode of the program as it executes. By comparing the resulting output, one gets a poor man's numerical stability analysis for the program. Although the analysis does not give any kind of guarantee about a program's stability, it can reveal genuine instability, and it does serve as a particularly useful and revealing idiot light. In our implementation, differences among the output files from the program's multiple runs are summarized in a report. This report is in fact an HTML version of the output file, with inline mark‐up summarizing individual differences among the multiple instances. When viewed with a browser, the differences can be highlighted or rendered in many different ways. Copyright © 2004 John Wiley & Sons, Ltd.     

基于区分服务的因特网电话服务质量保障

因特网电话是IP网上一种非常重要的实时数据业务．如何在网络流量背景复杂的情况下保证因特网电话的服务质量是当前的一个研究热点．本文提出了一种完全基于区分服务架构的方案，保证因特网电话对服务质量的要求，同时照顾其他流量的公平性．     

Bridging the gap between tracking and detecting changes in XML

There are two main approaches to manage changes in XML documents, change‐tracking and diff. Change‐tracking tools, which record edit actions while they are performed on the source document, are able to capture the exact editing process. That is much more difficult for diff algorithms, which have to reconstruct it by comparing two different versions. Interestingly, these algorithms process both text‐centric and data‐centric XML documents the same way. In this paper, we show that more accurate, clear, and human‐readable results can be achieved on text‐centric resources, by employing specific models and algorithms. We describe and discuss a specialized diff algorithm for such a class of documents. We also compare a Java implementation of the algorithm, named JNDiff, with other general‐purpose or data‐oriented diff tools, focusing on the quality of their output. Copyright © 2014 Copyright © 2014 John Wiley & Sons, Ltd.     

混凝土在海洋环境和除冰盐条件下的氯离子扩散行为

采用化学分析方法测定了普通混凝土（OPC）和高性能混凝土（HPC）在3种除冰盐条件和3种海洋区域暴露100d后的自由氯离子浓度分布．结果表明：氯盐暴露环境对混凝土的氯离子扩散行为具有显著的影响．在相同扩散深度时，混凝土内部自由氯离子浓度的大小顺序是除冰盐环境〉海洋环境．OPC〉HPC．混凝土表观氯离子扩散系数的规律是OPC〉HPC．进一步的研究指出．除冰盐环境比海洋环境更恶劣．HPC比OPC更适应恶劣的氯盐环境。     

基于GPRS的IP QOS方案

针对目前移动通信与数字业务相结合的过程中，QOS（服务质量）不能满足业务要求的问题，提出了一种新颖的解决方案，以此增强GPRS（通用分组无线业务）的服务质量，该方案融合了diff-serv（区分服务）和RSVP（资源预留）的原理。     

高能球磨法制备硅锗合金

以硅粉、锗粉为原料,用高能球磨法制备硅锗合金。采用X-射线衍射（XRD）、扫描电镜（SEM）以及能谱仪（EDS）研究了粉体随球磨时间的物相转变过程。结果表明,硅粉与锗粉经球磨时间为80h后合成出分散程度较高的SiGe二元合金。     

MPLS技术在基于Internet的实时视频传输中的应用和研究

针对目前在Internet中传输实时视频中所面临的问题，提出了应用MPLS技术解决视频数据在传输过程中丢失和延迟的构思，并从理论上阐述了技术应用的可行性。对电力系统中应用此项技术所带来的应用前景进行了一定的描述。     

差速器壳体铸造工艺设计及改进

主要介绍工程机械差速器壳体铸件的工艺改进过程。此零件由于结构复杂,零件本身存在较多热节处,零件材料又是球墨铸铁,所以出现缩松的倾向较大。在生产过程中确实发现大量零件出现缩松,从而导致零件报废,给企业造成了较大的损失。通过工艺方案的逐渐改进,最终消除了缩松缺陷的过程,为相关零件的铸造提供了经验依据。     

基于城市信息单元和差异注意力的多层行人重识别技术

在现实的智慧城市安全场景中,传统的行人重识别方法已经难以满足复杂多样的识别任务要求。为实现多层次的行人重识别,该文提出将行人重识别技术与多层次的城市信息单元深度融合。在行人重识别任务中,现有的模型和注意力只关注鲁棒特征的学习,而该文基于特征向量差异,提出了差异注意力模块,以增强深度特征的判别力。结合差异注意力模块,该文开发了与多种骨干模型适配的差异注意力框架。此外,该文还提出了联合训练和单独训练两种训练策略。与其他行人重识别方法相比,差异注意力框架和训练策略在 Market-1501、CUHK03 和 MSMT17 数据集上均取得了更优的性能。